Erosion and penetration rates of a pipe protruded in a sudden contraction

This paper addresses erosion prediction in 3-D, 90° elbow for two-phase (solid and liquid) turbulent flow with low volume fraction of copper. For a range of particle sizes from 10 nm to 100 microns and particle volume fractions from 0.00 to 0.04, the simulations were performed for the velocity range of 5–20 m/s. The 3-D governing differential equations were discretized using finite volume method. The influences of size and concentration of micro- and nanoparticles, shear forces, and turbulence on erosion behavior of fluid flow were studied. The model predictions are compared with the earlier studies and a good agreement is found. The results indicate that the erosion rate is directly dependent on particles' size and volume fraction as well as flow velocity. It has been observed that the maximum pressure has direct relationship with the particle volume fraction and velocity but has a reverse relationship with the particle diameter. It also has been noted that there is a threshold velocity as well as a threshold particle size, beyond which significant erosion effects kick in. The average friction factor is independent of the particle size and volume fraction at a given fluid velocity but increases with the increase of inlet velocities.

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“…Therefore, the equation of motion can be simplified to the following form:

where [ 27 ]

wherein Re p is the particle Reynolds number and is given as [ 28 – 30 ]

…”

Section: Governing Equations Of Turbulent Micro- and Nanofluids Ermentioning

confidence: 99%

Investigation of Micro- and Nanosized Particle Erosion in a 90° Pipe Bend Using a Two-Phase Discrete Phase Model

Safaei

Mahian

Garoosi

et al. 2014

The Scientific World Journal

111

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“…Many scholars such as Brown, Lee, Habit, Grant and Yao [3][4][5][6][7] have conducted massive theoretical investigations and practical explorations on the erosion phenomenon and obtained favorable results. Finite element simulations are often used in conjunction with the Lagrangian and Eulerian method to study gas-solid two-phase flow and friction phenomena in pipes [8][9][10] . Gabriel 11 utilized the Computational Fluid Dynamics(CFD) method and studied the erosion behavior of 90°elbow pipes in the petroleum industry.…”

Section: Numerical Simulation Of the Flow And Erosion Behavior Of Exhmentioning

confidence: 99%

Numerical simulation of the flow and erosion behavior of exhaust gas and particles in polysilicon reduction furnace

Wang

Jia

Mingquan

et al. 2020

Sci Rep

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In order to study the flow and erosion behavior of gas-solid exhaust in the polysilicon reduction furnace, the flow characteristics of exhaust gas and silicon particles were analyzed. The flow model and erosion model of exhaust gas and silicon particles were established based on the gas-solid flow theory and the erosion theory. The erosion and wear behavior of the gas-solid mixture in the flow passage pipeline were studied by numerical simulation. The results show that the wear and erosion from Nos. 1 to 8 regions at the bottom of the ring were caused by silicon particles colliding with high angle. The wear and erosion of 2 regions from Nos. 9 to 10 at the outside of the up azimuth on both sides of loop pipe outlets, 4 regions from Nos. 11 to 14 on the upper and lower wall of single furnace main channel were severely affected wear regions, which is caused by silicon particles with low angle and high velocity. Through comparative analysis, the erosion of upper wall of single furnace main channel is most serious. Increased gas velocity, particle concentration and particle size will exacerbate the erosion and wear rate of the pipeline in polysilicon reduction furnace, but the distribution and development of severe wear zone would not be affected significantly.

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“…Other forces, such as lift force, Basset force, and gravity force, contribute little to the particle motion under certain circumstances [22,32], and are not considered in this study.…”

Section: Mathematical Model For Particlesmentioning

confidence: 99%

“…The first region is near the orifice and the second is located in the flow reattachment zone. Habib and his group thoroughly investigated the erosion problems related to orifices [11] and pipes with sudden contractions [19,21,22]. In the last few years, a few researchers have started to pay attention to the evolution of surfaces on the erosion patterns for simple models [23][24][25], indicating that geometry variations can be an important factor affecting the erosion process.…”

Section: Introductionmentioning

confidence: 99%

Slurry Flow and Erosion Prediction in a Centrifugal Pump after Long-Term Operation

et al. 2019

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After long-term operation, the material loss due to slurry erosion often leads to significant changes in the impeller geometry. This change can, in turn, affect the flow characteristics and the erosion mechanism in a centrifugal pump. To investigate this matter, we consider two geometric models based on a prototype stainless steel impeller, which failed due to huge erosion problems from the pulp slurry. These two models are different in the degree of wear, with one model at the pre-erosion stage and the other with worn blades. For both models, the flow characteristics have been obtained in the Eulerian reference frame by means of the SST k-ω model. Then, in order to determine the erosion patterns, the particles have been tracked in the Lagrangian reference frame. In this way, the influence of the flow characteristics on the erosion patterns has been analyzed. Results show that the geometric variations greatly affect the flow characteristics, and consequently the erosion patterns. Particularly, it has been found that the clearance flow plays a significant role in defining erosion characteristics, such as erosion distribution, areas, and rates. Interestingly, the simulation results for current study show that the erosion rates after long-term operation greatly decrease near both the outlet edge and the blade bottom. It follows also that for accurate erosion predictions, these geometric variations have to be considered in the numerical model. This paper provides a better understanding of the complex erosion mechanism in centrifugal pumps, which can help to reduce the wear in future designs.

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Erosion and penetration rates of a pipe protruded in a sudden contraction

Cited by 30 publications

References 21 publications

Investigation of Micro- and Nanosized Particle Erosion in a 90° Pipe Bend Using a Two-Phase Discrete Phase Model

Investigation of Micro- and Nanosized Particle Erosion in a 90° Pipe Bend Using a Two-Phase Discrete Phase Model

Numerical simulation of the flow and erosion behavior of exhaust gas and particles in polysilicon reduction furnace

Slurry Flow and Erosion Prediction in a Centrifugal Pump after Long-Term Operation

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